Webber, who had a bitter intra-team fight with Red Bull's Sebastian Vettel, said: "It's going to be interesting, not just for the rest of the year.

"At the moment it's not a team. Is it OK to have them together in 2015?"

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Rosberg clips Hamilton in Belgian GP

He added: "It looks like the drivers are doing their own thing. Can they drive together in the future?"

Webber, who quit F1 at the end of last season for a career in endurance racing, said Mercedes were in a "very difficult situation where the drivers are not enjoying a good relationship".

Talking to Red Bull sports show Sport und Talk, the Australian added that he was not sure whether Mercedes motorsport boss Toto Wolff and the team's non-executive chairman Niki Lauda would be able to solve the situation.

"The thing is, who is now going to try to put this back together?" Webber said. "Is it the people who pay Niki's and Toto's wages?

"Because at the end of the day, if the drivers are not listening to these guys, do they have to say 'Lewis and Nico, you go chat to the big guys at Mercedes, because they're paying you guys to get the job done in a team environment'?"

Remaining Races

Venue

Date

Italian Grand Prix (Monza)

5-7 September

Singapore Grand Prix

19-21 September

Japanese Grand Prix (Suzuka)

3-5 October

Russian Grand Prix (Sochi)

10-12 October

United States Grand Prix (Austin)

31 October-2 November

Brazilian Grand Prix (Sao Paulo)

7-9 November

Abu Dhabi Grand Prix (Yas Marina)

21-23 November

Webber questioned Rosberg's motivation in the incident, which occurred when the Mercedes drivers were contesting the lead on lap two at Spa-Francorchamps on Sunday.

The collision left Briton Hamilton with a puncture that ultimately ended his race and Rosberg with a damaged front wing from which he fought back to gain second place behind Red Bull's Daniel Ricciardo.

"Well, it's... a passing move," Webber said. "Nico is trying to have a look on the outside, but it's Lewis's corner.

"At this point [just before the contact] Nico knows he has no chance to get the move done. It's strange that he tried to come in so tight behind Lewis.

The collision effectively ended Hamilton's chances of getting anything out of the race

"That was a little bit uncharacteristic of Nico - not normally his style, but he made contact.

"It wouldn't have been a big deal at all. It would have been nothing if there was no puncture, but the puncture changed the whole race. In the end both of their races were in trouble."

The result leaves Rosberg 29 points ahead of Hamilton in the championship with 200 still available in the remaining seven races.